I always felt it outed its creators as lacking theory of mind; why does a large group of people have different shared beliefs than me? They must lack the ability to think independently like everyone else in my cliquey subculture!
Group cognition (from a quick skim of a Wikipedia article about it) doesn't seem to justify lack of individual critical thinking though. It seems to be more like a term to describe a process, like "memes" and "idea viruses". It doesn't substitute for individual critical thinking.
Obsession with other people’s life stories leads to hero worship and constant comparison with them, making you unhappy because you couldn’t check off as many checkboxes as them. This is another form of unhealthy thinking, the inverse of narcissism.
You can live a life that concern only yourselves. Yes! Life is impermanent, obsessive with oneself and pain is everywhere. As a branch of Buddhism would said.
You can also note if that is so all religion and all givernment can disappear as love thy Neigbour, be empathy and still with the world instead of going to nirvana himself, many governments are bad but anarchy may not be good either.
No one sure what is the best approach for one life. But what you said seems odd.
May those died live in peace now. Let the living continue. We will continue do evil and good thing. Choose. Every seconds of it. That is life. RIP ultimately we all know.
As with any idea, the danger is in misapplication. For example, if someone simply stops trying to change others' minds when it's really still possible but the NPC meme causes them to ignore that possibility, then it doesn't help improve the world. Or if a misguided individual who doesn't distinguish meme from reality uses it to dehumanize people in their mind, then that's a problem.